Diesel fuel injection
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Diesel engines draw air only, past the intake valve into the cylinder. Fuel is injected into the cylinder at high pressure. The amount of fuel injected varies to suit load, and control engine speed.
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High pressure components
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For all diesel engines, at a fixed fuel setting, the amount of fuel delivered to the engine will increase as engine and pump speed increases. It must be controlled, or over-speeding of the engine will occur.
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Diesel fuel
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The cetane rating of a diesel fuel defines how easily the fuel will ignite when it is injected into the cylinder. The lower a fuel’s cetane rating, the longer it takes to reach ignition point.
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Diesel fuel characteristics
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The primary factors that affect the performance of diesel fuel are: the cetane rating, viscosity, its cloud point, the the extent to which the fuel is contaminated.
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Cetane number
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Cetane number or CN is to diesel fuel what octane rating is to gasoline. It is a measure of the fuel's combustion quality.
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The quiet diesel evolution
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Clean biodiesel fuels, dual fuel CNG/diesel injection systems and similar innovations are helping to clean up diesel emissions—and so are microprocessors. The improvements made in the last few years to light-duty diesel engines are very impressive.
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| Clean diesel technology |
Diesel automobiles are also making a comeback. Second-generation “refined power” diesel engines with greater efficiency and improved overall performance are part of the reason. |
